I think that's what they call the bootpage, cause that's supposed to be where they keep the which partitions to boot from info that gets re-written if there's a software upgrade sent down the line.

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That's it, and it's always the first 512 bytes on the drive. The first two bytes are an identifier (0x1492), the next two bytes identify the primary and alternate Root partitions, and that's followed by a 128 character boot parameter field. The primary and alternate partitions are usually 3 & 6 or vice versa.

Earlier models have some additional fields with the name, IP address and MAC address. Premieres and Roamios don't bother with that, but they have a 16 byte field that seems to be unique to each drive.

I don't know what "quietest ever" means, but I can hear a Red drive like any other hard drive out there. They still make noise.

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It may be a reference to one of my posts - I put a Red drive in my Roamio Basic, and I can only hear the hum of the drive with my ear a few inches from the case, and I can't hear this drive seek. Compared to the ~2 year old Green AV drive that is in the TiVo HD this Basic replaced, the Red drive is much quieter - for me it's essentially undetectable in the room. I could hear the TiVo HD seeking if it was very quiet otherwise.

...by "seeking" I mean the ticking noises you can hear when a drive is reading/writing data.

It may be a reference to one of my posts - I put a Red drive in my Roamio Basic, and I can only hear the hum of the drive with my ear a few inches from the case, and I can't hear this drive seek. Compared to the ~2 year old Green AV drive that is in the TiVo HD this Basic replaced, the Red drive is much quieter - for me it's essentially undetectable in the room. I could hear the TiVo HD seeking if it was very quiet otherwise.

...by "seeking" I mean the ticking noises you can hear when a drive is reading/writing data.

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Anandtech compared NAS drives about a week ago. The lowest noise db rating went to the Seagate NAS drive. I have the 3TB Seagate NAS drive in my Roamio Plus and can barely hear it. It's definitely not silent, but also not disruptive. YMMV